Visual Inspection; At Startup; During Operation - HP Z8 G4 User Manual

Visual inspection

If you encounter a problem with the computer, monitor, or software, the following general suggestions might
help you isolate and focus on the problem before taking further action.

At startup

Verify that the computer is plugged into a functional AC outlet.
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Remove all optical discs and USB flash drives before starting the computer.
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Verify that the computer is on and the power light is on.
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If you have installed an operating system other than the factory-installed operating system, confirm
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that it is supported on your system by going to http://www.hp.com/go/quickspecs.
Verify that the display panel is lit.
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If you have an optional external monitor:
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Verify that the monitor is plugged into a functional AC outlet.
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Verify that the monitor is on and the green monitor light is on.
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If the monitor is dim, turn up the brightness and contrast controls.
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During operation

Beeps and blinking lights on the computer are error codes that can help you diagnose problems. For
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more information on interpreting these codes, see the Diagnostic LED and audible (beep) codes section in
the Maintenance and Service Guide for your computer.
Press and hold any key. If the system beeps, your keyboard is operating correctly.
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Check all cables for loose or incorrect connections.
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Wake the computer by pressing the power button or any key on the keyboard. If the system remains in
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standby, shut down the system by pressing and holding the power button for at least four seconds. Then
press the power button again to restart the system.
If the system does not shut down, unplug the power cord, wait a few seconds, and then plug it in again.
If the system does not restart, press the power button.
Be sure that all required device drivers have been installed. For example, if you have connected a printer,
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you must install a printer driver.
If you are working on a network, use another cable to plug your computer into the network connection.
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If you still cannot connect, there might be a problem with the network plug.
If you recently added new hardware, remove the hardware to see whether the computer functions
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properly.
If you recently installed new software, uninstall the software to see whether the computer functions
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properly.
If the display panel on an all-in-one computer is blank, open the computer and be sure that both ends of
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the cable between the system board and the display panel are connected. If you are using a graphics
card, verify that the card is properly installed.
32 Chapter 7 Maintenance, diagnostics, and minor troubleshooting